Dermapen micro-needling techniques involve using multiple tiny, sterilized needles to puncture the skin and increases the collagen production during healing process of the skin, this process keeps the skin youthful with a frim and smooth texture. AUDUODUO Dermapen tip features our patented technologies and outfitted with multiple cartridges- 12 /24 /36 /42 needles and NANO-R., The needle length can be precisely adjusted from 0.2-2.5mm. Our AUDUODUO derma pen kit includes 10 extra fully sterilized and sealed needles with 12 pins.